改善二次加密层系油层动用状况研究

STUDY ON THE IMPROVEMENT OF RESERVOIR PRODUCING CONDITION OF SECONDARY INFILLING SERIES OF STRATA

大庆油田萨北开发区的二次加密调整层系至今已注水开发 10年。目前其产量只占水驱产量的2 8 99% ,仍有 30 %以上的砂岩厚度未动用 ,在今后一个时期仍是水驱开发调整的主要对象 ,因此有必要探讨改善二次加密井开发效果的方法。本文对萨北开发区二次加密调整层系油层未动用原因进行了分析 ;对提高二次加密油层吸水状况、增加产液厚度的主要做法以及所取得的效果进行了总结。研究结果表明 ,针对不同时期油井受效状况 ,注水井采取提高注水强度、细分注水、措施改造以及浅调剖可改善油层吸水状况 ;在油井注水受效后的 2～ 5年实施改造措施 ,并根据实际情况对措施进行优化 ,能改善油层动用状况 。

The secondary infilling series of strata in Saber development area in Daqing Oil Field is development by water flooding for 10a. Now its oil production only occupies 28 99% of water flooding production. There is still more than 30% sand stone thickness which is not producing, which is a main object of water flooding development adjustment. So it is necessary to discuss the development effect and method for improving secondary infilling wells. This paper analyzes the reason of non producing reservoir in the secondary infilling series of strata in Sabei development area and summarizes the method of improving water absorbing status of secondary infilling reservoir and increasing produced fluid thickness and its effect. The result shows that, according to the effective status of oil wells in different stages, increasing water injection strength, subdividing water injection, stimulation reform and shallow profile control can improve the reservoir water absorption status. Performing stimulation 2 5a after the water injection effect of oil well and optimizing stimulation according to actual status can improve the producing status of reservoir and ultimate recovery.